ntc350 bc cummins no power in high gears?

well so that this wont go on any longer here im going to need to get back to you guys. I have the engine on the truck taken apart as it sprung a knock, which appeared to be a dead piston with a leaky sleeve seems it was repaired a couple months before I got truck as gaskets look pretty new. it hadn't been running like that I had pulled a load on Monday and when I was going up a slight incline at about 60mph truck made a weird rattling/gargling sound as it was pulling up hill, I finished trip and payed it no mind till I got off at customer and heard a knock but on the expressway it was not AS audible. Well its apart now looks like it will be getting a complete inframe, 3 reconned heads and have the block decked. oh well.... my bud told me that the valves weren't fully seated whats up with this? could it be they hit the piston? WTF? tomorrow morning I will be heading over early to get this truck running he told me he could have me up and running by midweek next week, plus I lucked in as he had no other major jobs in the shop to have done. hopefully this will be the key to why this thing didn't want to pull? valves not closing to me on GAS vehicles means no boost will be held..... crap it should run like a raped ape with no BLOWBY or somke will just some black smoke. Next will be a 13spd if I can find one.

lets see what happens guys I will keep you posted.

 

I had one more question guys I wanted to know if the way truck is geared,transed and tired right now if 63-65mph @1650-1700 is to high of an rpm to run an old 855 on the eway at? im used to running my trucks in the 1500 rpm range but most of those were CATs any input....

 

im goin to have to do that myself

 

it is an 840 cpl and the kit im buying is for the 840 cpl what else should i need to know besides that?